linux-kernel - [PATCH v7 1/3] vduse: validate block features only with block devices

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Date: Tue,  9 Jan 2024 12:10:23 +0100
From: Maxime Coquelin <maxime.coquelin@...hat.com>
To: mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	xieyongji@...edance.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	david.marchand@...hat.com,
	lulu@...hat.com
Cc: Maxime Coquelin <maxime.coquelin@...hat.com>,
	Eugenio Pérez <eperezma@...hat.com>
Subject: [PATCH v7 1/3] vduse: validate block features only with block devices

This patch is preliminary work to enable network device
type support to VDUSE.

As VIRTIO_BLK_F_CONFIG_WCE shares the same value as
VIRTIO_NET_F_HOST_TSO4, we need to restrict its check
to Virtio-blk device type.

Acked-by: Jason Wang <jasowang@...hat.com>
Reviewed-by: Xie Yongji <xieyongji@...edance.com>
Reviewed-by: Eugenio Pérez <eperezma@...hat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@...hat.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 0ddd4b8abecb..a5af6d4077b8 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1671,13 +1671,14 @@ static bool device_is_allowed(u32 device_id)
 	return false;
 }
 
-static bool features_is_valid(u64 features)
+static bool features_is_valid(struct vduse_dev_config *config)
 {
-	if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
+	if (!(config->features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)))
 		return false;
 
 	/* Now we only support read-only configuration space */
-	if (features & (1ULL << VIRTIO_BLK_F_CONFIG_WCE))
+	if ((config->device_id == VIRTIO_ID_BLOCK) &&
+			(config->features & BIT_ULL(VIRTIO_BLK_F_CONFIG_WCE)))
 		return false;
 
 	return true;
@@ -1704,7 +1705,7 @@ static bool vduse_validate_config(struct vduse_dev_config *config)
 	if (!device_is_allowed(config->device_id))
 		return false;
 
-	if (!features_is_valid(config->features))
+	if (!features_is_valid(config))
 		return false;
 
 	return true;
-- 
2.43.0